E tender for One time repair Overhauling of 1200KW Mobile Trailer Mounted Battery Charger Cum Rectifier for NDV

Laying and Jointing PVC Pipe. Heading

Main power unit Overhauling of unit cooling blowers, powder coating paint to blower unit. Maintenance of thyristor cooling fans and put powder coated paint to fan units. Replacement/testing the thyristors on test bed and do the maintenance of thyristors and heat sinks Replacement/testing condition of temperature sensors and calibrate it. Replacement of input and output ACBs with motorized operated, suitable to existing system, and also provide necessary push buttons to ON and OFF the input and output ACBs at control panel unit. Maintenance of main transformers, IPTs and choke coils, varnishing of main transformer core and windings as per IS standards, change the base vibrating mounting pads. Replacement of output filter capacitor banks to all bridges. Replacement of snubber capacitor networks to all bridges. Replacement of control wiring to entire bridges. Replacement/testing/calibration of DC current shunts. Replacement of the all fasteners with SS material. Replacement of bridge protecting PVC transparent sheet. Replacement of space heaters inside the mobile unit Operationization of 01 in No of defective thyristor bridges. Note: Provide test certificates to SCRs, temperature sensors from NABL lab only

Trailer unit Replacement of window glass with tempered window glass along with rubber beading, and change the beading to all mobile doors and windows. Replacement of 04 in nos solid tyres with inners and outer wheel bearings. Maintenance to towing system to unit. Repair/replacement of equipment jacks Repair the structure damaged in and outside of entire unit. Chipping and power coated painting to entire inner and outer side of the unit with 02 coats of red oxide and 02 coats painting as per existing colour, and also do the Stenciling work to the mobile unit. Labelling of All Control Cards, relays, transformers and other auxiliaries inside the total unit

Acceptance criteria for battery charging rectifier load trials:- The Mobile Battery Charger cum Rectifier will be considered as commissioned by the user on successful completion of the following tests / activities in addition to trial conducted by the supplier as per trial schedule for operation in both the modes of the Mobile Battery Charging Rectifier i.e. Battery Charging Mode Operation and DC Rectifier Mode Operation in Auto and Manual: - No load condition. The output DC Voltage of the mobile battery charger shall be without any variations and oscillation. Insulation test (not less than 25 Mega Ohm). No Load DC Output Voltage Variation Test from 175 V to 380 V DC. IP/OP Over Voltage Tripping Test (457 V AC / 383 V DC). IP/OP Under Voltage Tripping Test (353 V AC / 161 V DC). IP Phase Sequence Reversal Protection Test. Over Temperature protection test for Semi-Conductor devices. No Load / Ripple checking Test less than 1%. Reverse polarity Protection test. On load condition. The Mobile Battery Charger cum Rectifier shall be subjected following tests in both Constant current mode and Constant Voltage Mode of operation: - Constant voltage mode:- Set the voltage at various set points at 175V, 240V and 380V and perform the trial. (i) First stage: - To subject the mobile battery charger to 25% of its full loading capacity continuously for 04 Hours(ii) Second stage: - To subject the mobile battery charger to 50% of its full loading capacity continuously for 04 Hours. (iii) Third stage: - To subject the mobile battery charger to 75% of its full loading capacity continuously for 04 Hours. (iv)Fourth stage: - To subject the mobile battery charger to 100% of its full loading capacity continuously for 12 Hours. Note: at various set voltages 175Vdc, 240V, 380V, the rectifier gives 1381Adc, 1895A and 3150Adc respectively. Constant current mode:- Set the current at various set points at 100A, 400A, 750A, 1500A, 2250A and 3150ADC Instantaneous load trials:- The Mobile Battery Charger cum Rectifier shall be subjected following tests in both Constant Voltage Mode of operation: - First stage: - To subject the mobile battery charger to 25% of its full loading capacity. Second stage: - To subject the mobile battery charger to 50% of its full loading capacity. Third stage: - To subject the mobile battery charger to 75% of its full loading capacity. Fourth stage: - To subject the mobile battery charger to 75% to 100% of its full loading capacity. Observer the DC output voltage recovery time, ripple, and all other indicating parameters. The above trial performed at various set voltages 175V, 240V,380VDC Following observations will be monitored by the firm, user during the various tests mentioned at Para 15: - Input/ output ACB Overload test O/P terminal Short Circuit Test at 3000 A. 110% Overload Test for 10 Minutes (3300 A) Ripple checking Test less than 1%, at any voltage and current in both constant voltages, current mode from no-load to full load. Reverse polarity Protection test. Over power protection. Parameters (IP/OP voltage and current, power, Temperature) checking with supply Voltage atall four stages mentioned above. The output voltage/ current of the mobile battery charger unit shall be stable without any variations and oscillations on various load conditions Voltage regulations of +/- 1% against input and output load variations and temperatures variation 20 to 50 Degrees with relative humidity of 85%. Observe the input current unbalance is less than or equal to +3%. All protection as enumerated at the tender enquiry / scope of work. Note: 175V, 240V, 380V set voltages on Constant voltage mode follow the steps (i) to (iv) and 100A, 25%, 50%, 75%, 100% of its rated current of the unit on Constant current mode follow the steps (i) to (iv). Check each and every stage, the bridges should share load equally with variation acceptable up to + 1 to 3% of its set value of load current. Refer to the QMS-N for Major Overhauling of main, dimmer transformer, rectifier control panel, input, output panels, breakers, control cards testing/repairing and structural repairs and painting (battery charger cum rectifier) QMS-N Document No: IR/YU/PD/98-28 Follow the above document to do the repair/overhauling battery charger cum rectifier

statcon energiaa pvt ltd

HEPTAGON TECHNOLOGIES

NATIONAL ELECTRONICS LABORATORY

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